Professor of Physics
Remote Sounding of Atmospheric CompositionStratospheric ozone has declined significantly since about 1980 in response to enhanced chlorine resulting from anthropogenic emissions of chlorofluorocarbons. This is particularly true in the Arctic, where spring ozone columns show large interannual variability and chemical ozone loss is critically dependent on low stratospheric temperatures. Ozone is well known as a highly effective absorber of solar UV-B radiation, which is the dominant source of heating in the stratosphere; decreasing ozone thus reduces radiative forcing and is clearly linked to climate. One of the key challenges facing atmospheric scientists today is the unravelling of chemistry-climate interactions.
The goal of my research program is to improve our understanding of the chemical and physical processes driving atmospheric change through remote sounding of atmospheric composition from ground-based, balloon-borne, and satellite platforms. To achieve this, we use a variety of spectroscopic instruments and analysis tools, collaborate with atmospheric modellers, and conduct supporting radiative transfer and laboratory spectroscopy studies. We seek to address such questions as:
• How and why is the chemical composition of the atmosphere changing with time?
• How is atmospheric chemistry coupled to dynamics, microphysics, and radiation?
• What is the impact of climate change on future ozone depletion, particularly in the Arctic?
To learn more about my research, please visit my homepage: